Check SD Card speed in Raspberry Pi

To check the read/write speed of SD Card using in raspberry Pi, we can use the command dd.

- Check write speed:
$ sync; time dd if=/dev/zero of=~/test.tmp bs=500K count=1024; time sync

- Check read speed:
$ dd if=~/test.tmp of=/dev/null bs=500K count=1024

- Remove ~/test.tmp after tested:
$ rm ~/test.tmp

Reference: http://elinux.org/RPi_SD_cards#Terminal_Commands

Check SD Card speed in Raspberry Pi